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Ca / Mg / Al hydrotalcite synthesis in PVC

Author: LiuZhiYuan
Tutor: YangZhanHong
School: Central South University
Course: Applied Chemistry
Keywords: Ca / Mg / Al hydrotalcite Flame retardant Smoke suppression Coprecipitation
CLC: TQ325.3
Type: Master's thesis
Year: 2007
Downloads: 326
Quote: 5
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Abstract


This thesis a new kind of inorganic heat stabilizers , flame retardants of --Ca/Mg/Al hydrotalcite-like synthetic process and thermal stabilization effect around of Ca / Mg / Al hydrotalcite-like preparation conditions , structure and performance study . Under suitable conditions , the co-precipitation method and synthesized a series of Mg-Al hydrotalcite . The adjustable features based on the of laminates of Mg-Al hydrotalcite body chemical firstly explore the possibility of Mg-Al hydrotalcite doped calcium . Laminates chemical composition having a flame retardant and smoke suppression function of calcium introduced into the main body of Mg-Al hydrotalcite , some magnesium ions, all substituted on the shelves through experiment to achieve a product of a layered structure calcium Mg-Al type metaclass hydrotalcite and hydrotalcite synthesis of calcium aluminum type Binary class . Using XRD, FT-IR were characterized by their composition and structure . XRD test results prove that the layered structure of the hydrotalcite both the synthesized samples , crystalline , and of high purity . IR analysis tests prove the synthetic samples interlaminar anion is a good symmetry CO 3 < / sub > 2 - < / sup> , further confirmed the successful synthesis of the Ca / Mg / Al hydrotalcite . This thesis through a large number of experiments , to discuss the source of raw material , temperature, pH and Mg / Al ratio , agitation speed, and the structure and properties of the impact of factors such as the feed volume flow of synthetic hydrotalcite , so that during the reaction can be carried control of the reaction conditions to meet the synthetic demand . According to the special features of calcium / magnesium / aluminum hydrotalcite in this paper for the first time as flame retardants , heat stabilizers in PVC . The experimental results show that the calcium / magnesium / aluminum hydrotalcite-like can improve the thermal stability of PVC . Under comparable conditions , the MgAl- CO. 3 - LDHs 's , flame retardant and smoke suppression performance is better than Al (OH) 3 Mg (OH ) 2 < / sub>. In the case of the same added amount (20Phr) calcium magnesium aluminum type ternary hydrotalcite-like performance better than the Mg-Al hydrotalcite and calcium aluminum hydrotalcite flame-retardant and smoke suppression performance show that Ca 2 has a role to improve the material is flame retardant and smoke suppression performance .

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polymer resin and plastic > PVC and plastic
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